[CodeCamp #83] Support Restormer model

[AlexZou14]

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Motivation

Support Restormer of image restoration
Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Please briefly describe what modification is made in this PR.

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BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 60.70% // Head: 88.09% // Increases project coverage by +27.38% 🎉

Coverage data is based on head (9639b5c) compared to base (00852b2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           dev-1.x    #1503       +/-   ##
============================================
+ Coverage    60.70%   88.09%   +27.38%     
============================================
  Files          326      385       +59     
  Lines        19974    24358     +4384     
  Branches      3330     3811      +481     
============================================
+ Hits         12126    21458     +9332     
+ Misses        7445     2081     -5364     
- Partials       403      819      +416     

Flag	Coverage Δ
unittests	88.09% <ø> (+27.38%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...edit/models/editors/pconv/pconv_encoder_decoder.py	76.19% <0.00%> (-17.15%)	⬇️
.../models/editors/global_local/gl_encoder_decoder.py	88.00% <0.00%> (-12.00%)	⬇️
mmedit/models/losses/pixelwise_loss.py	94.59% <0.00%> (-5.41%)	⬇️
mmedit/datasets/transforms/crop.py	85.38% <0.00%> (-2.36%)	⬇️
mmedit/datasets/transforms/formatting.py	84.71% <0.00%> (-1.86%)	⬇️
mmedit/registry.py	100.00% <0.00%> (ø)
mmedit/utils/typing.py	100.00% <0.00%> (ø)
mmedit/apis/__init__.py	100.00% <0.00%> (ø)
mmedit/utils/__init__.py	100.00% <0.00%> (ø)
mmedit/engine/__init__.py	100.00% <0.00%> (ø)
... and 283 more

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[CLAassistant]

All committers have signed the CLA.